<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.box {
				width: 200px;
				height: 200px;
				border: 1px solid black;
			}

			.container {
				background-color: rgb(255,255,0);
				margin:50% auto;
				width: 70px;
				height: 70px;
			}
		</style>
	</head>
	<body>
		<div class="box">
			<div class="container"></div>
		</div>
	</body>
</html>
